Shadow Mask Plasma Display Panel Research Articles

Flat panel detector based on a shadow mask plasma display panel

AbstractA flat panel detector based on the structure of a shadow mask plasma display panel is analyzed in terms of the electron amplification factor when used in the Townsend mode. The detector consists of a metal shadow mask and two ultra‐thin glass substrates with electrodes depositing on them. The shadow mask divides the detecting area into arrays of independent cells. The electron gain and linearity of the device are investigated by simulation based on the particle‐in‐cell/Monte Carlo collision model. Similar experiments are carried out. Both experimental and simulation results show that the linearity of the detector is significant. The applied voltages and the effective cathode area are parameters affecting its gain. As the avalanche process in the center of the cell with small electric field strength is much smaller than that near the shadow mask edge, the gain increases exponentially with the anode voltage but decreases with the negative shadow mask voltage. The balance between effective cathode area and high electric field intensity near the shadow mask edge provides room for future optimization of the detector. In conclusion, the flat panel detector is a promising component in a detection system for high energy radiation, and the wide application of the device is expected.

17.4: Fluid Simulations and Experiments for Ultra‐Thin Shadow‐Mask PDP

AbstractAn ultra‐thin shadow mask plasma display panel is suitable for double‐sided display and 3D display. A self‐consistent fluid model is used to analyze the discharge characteristics of the ultra‐thin SMPDP cell. The discharge processes of ultra‐thin SMPDP and normal SMPDP are almost same proved by fluid model and ICCD images. Moreover, both the simulation and experimental results indicate that the discharge efficiency can be highly improved by using the ultra‐thin glass as dielectric layer for its 50‐70μm thick and 6.7 dielectric constant in ultra‐thin SMPDP compared to normal SMPDP especially in high Xe ratio.

7.3: Distinquished Paper: Ultra‐Thin Shadow‐Mask PDP Fabricated by Vacuum In‐line Sealing Technology

AbstractAn ultra‐thin shadow mask plasma display panel is put forward to meet the market demands of a much thinner, lighter and flexible display. Thanks to the ultra‐thin 70μm thick glass, a special vacuum in‐line sealing technology could be used to fabricate the novel device without a pumping tube. The sealed panel is only 300μm thick. The sealing characteristics and the discharge characteristics are investigated. The experimental results indicate that a high ratio of Xe in the gas mixture can be used, thereby improving the performance of the ultra‐thin SMPDP. In future applications AF32 type of foil glass will be used with a dielectric constant of 5.1. In addition a sealing temperature of 600 °C or higher will enable to exploit the full benefits of MgCaO protective layer. The ultra‐thin panel is well suited both for a double‐sided display and for 3D‐display.

An ultra-thin Shadow Mask Plasma Display Panel

An ultra-thin (260μm) Shadow Mask Plasma Display Panel (ultra-thin SMPDP) which meets the demands of further reducing the thickness and weight of display panels has been developed. This device is also an important candidate for semi-flexible and/or semi-transparent display. Its discharge performance has been investigated based on the fluid model. The result shows that the discharge efficiency is improved by about 20% thanks to the low relative permittivity of the ultra-thin glass foil. Both firing and sustaining voltage of the ultra-thin SMPDP will increase about 15V if a 30μm ultra-thin glass is used. Considering the influence of the thickness of ultra-thin glass foil on the driving voltage, 50μm is chosen as the optimal thickness for the ultra-thin SMPDP. In addition, a 5cm×5cm tubeless panel has been made using an in-vacuum sealing technique. Moreover, the driving voltage and discharge process of the panel have also been measured. It has been found that the discharge is confined in the center of the cell, where the electric field is weaker during each sustain period. Theoretically, this will further increase the discharge efficiency. However, the measured difference between firing voltage and sustain voltage is relatively small compared with the simulation, indicating a loss of wall-voltage.

Simulation studies of the dielectric layer effect on the discharge characteristics of the shadow mask plasma display panel

The shadow mask plasma display panel, developed from the alternating current matrix plasma display panel, possesses several interesting features such as a simple manufacturing process, low cost, and short response time. The discharge process in cells with different dielectric layer thicknesses and relative permittivities at the same driving voltage was simulated based on a particle-in-cell/Monte Carlo collision model. It was found that the discharge characteristics were improved with an increase in the relative permittivity and a reduction in the dielectric layer thickness. The mechanism used in this phenomenon was analyzed theoretically and verified further by simulation, using different driving voltages. The results imply that the luminous efficacy can be improved either by reducing the relative permittivity or by increasing the thickness of the dielectric layer.

58.4: Improvement of Luminous Efficacy of Shadow Mask Plasma Display Panel

AbstractThe electron temperature and discharge efficiency in the cell of a shadow mask plasma display panel are calculated with OOPIC and the fluid model respectively. The results show the relationship between electron temperature and discharge efficiency, and the variation with the dielectric layer thickness and Xe concentration. Further analysis shows that the discharge efficiency with higher Xe excitation efficiency is improved by the reduction of the electron temperature.

Study of An Unsymmetrical Shadow Mask PDP with High Luminous Efficacy

A new shadow mask plasma display panel (SMPDP) is presented in this article. The unsymmetrical geometry structure of the discharge cell is its main feature. A macro-cell with a ratio of 40:1 was designed and fabricated. The geometrical parameters and electrode's structure of the discharge cell of the unsymmetrical SMPDP were optimized. Compared with current SMPDP, its luminous efficiency was obviously improved. Then a 32-inch wide video graphics array (WVGA) unsymmetrical SMPDP with a luminous efficacy of 1.8 Lm/W was produced.

A Novel Latch-Up Protection for Bulk-Silicon Scan Driver ICs of Shadow-Mask Plasma-Display Panel

This letter reports a low-cost and excellent latch-up protection technology for bulk-silicon scan driver ICs of shadow-mask plasma-display panel (SM-PDP) by integrating a 100-V lateral double-diffused (LD) MOS and a standard low-voltage (LV)-CMOS control circuit. The technology is implemented using an N+ guard ring in the LV-n-well, a P+ guard ring in the p-substrate near the LV-nMOS, and a deep high-voltage (HV)-n-well and a p-drift guard ring between the HV-nLDMOS and LV-CMOS circuits. The experiment results show that the latch-up in the LV-CMOS circuits is avoided when the scan ICs are applied with -340 V during the sustain periods.

Investigation of Anode Striation in 34" VGA Shadow Mask PDP

A macro-cell was used to study the phenomenon of anode striation ona 34 VGA Shadow Mask Plasma Display Panel (SMPDP). The breakdownprocess in the sustaining period of the macro-cell was taken by an Intensified Charge Coupled Device(ICCD) with narrow band filters. The mechanism of formation andevolution of the anode striation on SMPDP were investigated. Theinfluence of the width of the electrode, the sustaining voltage,sustaining frequency and the voltage of the shadow mask on the anodestriation was also studied. The results showed that the width of theelectrodes, the sustaining voltage and frequency had a stronginfluence on the anode striation. The voltage of the shadow mask,however, hardly affected the anode striation,the firing voltage or the sustaining voltage.

Effects of ramp reset pulses on the address discharge in a shadow mask plasma display panel

A two-dimensional self-consistent numerical simulation model is used to analyse the effects of the ramp reset pulses on the address discharge in a shadow mask plasma display panel (SM-PDP). Some basic parameters such as the slope of the ramp pulse and the terminal voltage of the ramp reset period are varied to investigate their effects. The simulation results illustrate that the wall voltage is mainly decided by the terminal voltage and the firing voltage at the end of the ramp reset period. Moreover, the variation of the ramp slope will also bring a few modifications to the wall voltage. The priming particles in the beginning of the addressing period are related to the slope of the ramping down voltage pulse. The simulation results can help us optimize the driving scheme of the SM-PDP.

Discharge efficiency of a 25-in. high-resolution SMPDP

— A novel round subpixel and triangle-arrangement shadow-mask plasma-display panel (SMPDP) suitable for high-resolution displays has been investigated. The discharge efficiency of this high-resolution SMPDP and the AC coplanar PDP (ACCPDP) has been calculated separately. The variance of the discharge efficiency with pressure and xenon content will be reported. Results indicate that the SMPDP can reach a higher efficiency for high-resolution displays than conventional ACCPDPs.